Code-Snippets-Functions/Execute a function on a child site/WooCommerce/set-gtin-from-sku.txt

add_filter( 'woocommerce_structured_data_product', 'wc_set_gtin_from_sku', 9999, 2 );
 
function wc_set_gtin_from_sku( $markup, $product ) {
   $markup['gtin8'] = str_replace( '-', '', $markup['sku'] );
   return $markup;
}